Telegraphy.



PATENTED SEPT. 20,1905.

F. W. JONES. TELEGRAPHY.

APPLICATION FILED MAR.3 1, 1905.

UNITED STATES FRANCIS W. JONES, on NEW YORK, N. Y.

TELEGRAPHY.'

7 Specification of Letters Patent.

. Patented Sept. 26, 1905.

Application filed March 31, i905. $erial No. 253,010-

To all whom, it may concern:

Be it known that I, FRANoIs W. JONES, a citizen of the United States, residing in the city of New York, county and State of New York, have made certain new and useful Improvements in Telegraphy, of which the following is a specification.

My invention relates to that form of multiplex telegraphy in which a telegraph-circuit has superposed upon it rapid alternations or impulses of opposite polarity, the second set of signals being formed by varying such alternations or impulses.

I The object of my invention is to provide an arrangement of apparatus which may be used upon more extended circuits and in which the alternating-current impulses are more effective, the signals being stronger and firmer than in any arrangement heretofore known or used.

In this invention any suitable form of telegraph-circuit is employed having means for signaling, as by the Morse or some equivalent code. Terminal and way stations being equipped as described, additional stations or additional signals may be simultaneously transmitted, according to this invention, by

providing at two or more points or stations any suitable form of generator of short and rapidly-recurring impulses of opposite polarity, such as are due to an alternating dynamo yielding four or five hundred alternations per second. It has heretofore been proposed to inductively connect such a generator with such a main circuit; but my improvement consists in cutting such a generator in and out of the main circuit in the 'act of transmitting signals, while maintaining the line intact by the use of a continuity-preserving transmitter and providing a resistance to compensate for the removal of the described generator from the main line at such times or intervals as the generator is cut out. All the first-named sets of instruments are bridged by a branch circuit containing a condenser in a well-known manner to' provide a free path or circuit for the described alternating impulses.

The accompanying drawing illustrates my invention.

m is .amain telegraph-circuit having three separate signaling-stations 5, 6, and 7. There are suitable generators 3 and 4 at opposite terminal stations connected in series in the circuit. Both generators and the sets of Morse apparatus shown at each station are bridged or spanned by a branch circuit connet, and local circuit.

I taining a condenser is, the object being to form a path or circuit for the alternating-currents impulses that shall be free from the inductance due to the instruments in the main circuit and shall at all times be free for the passage of such impulses. a and Z) are two additional signaling-stations located at separated points on the circuit m. The apparatus is duplicated at both stations, and I have employed the same designating characters for the same elements at each station.

g is an alternating-current generator, preferably constantly operating and producing, say, four hundred alternations per second. It

is in a branch or local circuit 90, and there is a resistance R, preferably a coil of wire, included in the main line 122. at eachstation, the amount of the resistance being equivalent to the resistance .due to the presence of the generator g in the main line. The transmitter-t is a continuity-preserving transmitter operated by the usual arrangement of key, mag- The branch is connected to the main line m at 94, its opposite terminal being connected to the contact-stop 91 of the. transmitter 25. The main line m is divided. One, terminal is connected tothe lever of the transmitter at 92. The other terminal is connected to an independent lever of the transmitter 25 at 93.

When the terminal 6 is operated by closing the Morse key, circuit passes from 94, via 90 g 91 93, to on. When the Morse key is opened, circuit passes from 94:, via resistance R, to the transmitter-lever at 92, to the independent lever at 93, and to the main line m, so that the operation of the transmitter 6 without opening the circuit substitutes the generator g for the resistance R, and vice versa, for intervals equivalent to the duration of the elements of the Morse code as determined by the operationof the Morse key.

The receiving device consists of a polarized relay 7, operating a local circuit 20, contain ing the coils. of repeating-sounder 21. The sounder 21 operates a local circuit 22, containing the coils of 'a reading-sounder 23. Inthe main line is aninductive resistance 2', and the relay r is in a branch or local circuit 10, including a condenser 0,'the terminals of which branch are connected to the main line at 51 and 52 upon opposite sides of the inductance i.

The operation of the apparatus is as follows: Communications and signals are made, and exchanged between the stations 5, 6, and 7 by making and breaking the circuit joining the generators 3 and 4 in the well -known manner characteristic of a simple Morse circuit. Signals are made and transmitted interchangeably between the stations at and b by operating the Morse key controlling the continuity-preserving transmitter 25. Signals between the stations 5, 6, and 7 pass from the line m and through the inductance without effect upon the relays '1'. When the generator g is included in the line m, the inductance 2' causes the condenser c to take an increased eharge,'the relay 1' responds, its tongue standing in an intermediate position between the contact-stops, thus opening the circuit 20, which was normally closed, and closing the circuit 22, which was normally opened, so that during the transmission of a dot or a dash the generator 9 is included in the main line m and the sounder 23 closed. Spaces between the dots and dashes or between signals result from withdrawing the generator g and substituting the resistance R to preserve the strength of current in the circuit m unchanged.

By the arrangement shown and described the full strength of the current impulses generated at g are effective in the main line, and by the use of an inductance 2' the relay 9' is afiiected to an extent determined by the amount of inductance at 2'.

What I claim, and desire to secure by Letters Patent, is

1. The combination of a telegraph-circuit with suitable generators, transmitting and receiving apparatus, a branch circuit at each station connected to the main circuit at opposite terminals of the apparatus, a condenser in each said branch and two or more sets of signaling apparatus at separated points on said circuit, each set including an alternatingcurrent generator in a branch circuit, an artificial resistance in the main line, a continuitypreserving transmitter for inclu ling the generator and excluding the resistance and vice Versa with respect to the main circuit and a receiving instrument suitably connected with the main line.

2. The combination of a telegraph-circuit including suitable generators, transmitting and receiving apparatus at separated stations, a branch circuit at each station connected to the main circuit at opposite terminals of the apparatus, a condenser in each such branch and two or more sets of signaling apparatus at separated points or stations on said circuit, each set including an alternating-current generator, an artilicial resistance, a continuitypreserving transmitter connected with the main line and with said generator and resistance, so that upon the operation o'l the transmitter the resistance will be excluded and the generator included with respect to the main line, and vice versa, an inductive resistance in the main line, a branch circuit connected to the main line upon opposite sides of said resistance and a suitable receiving instrument with a condenser in series therewith in said branch.

FRANCIS \V. J ON ES.

Witnesses:

JOHN F. CLnvnRDoN, HARR R. MoNAn'AN. 

